Dust-collector



(No Model.)

J. A. & E. P. WOODBURY.

DUST COLLECTOR.

No. 408,907. Patented Aug; 13, 1889.

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UNITED STATES PATENT OEEIcE.

JAMES A. WVOODBURY, OF WINCHESTER, AND EDlVARD F. \VOODBURY, OF BOSTON, MASSACHUSETTS.

DUST-COLLECTOR.

SPECIFICATION forming part of Letters Patent No. 408,907, dated August 13, 1889.

Serial No. 268,565. (No model.)

To aZZ whom it may concern:

Be it known that we, JAMES A. VVOODBURY, of WVinchester, in the county of Middlesex, and EDWARD F. WooDBURY, of Boston, in

the county of Suffolk and State of Massachusetts, have jointly invented certain new and useful Improvements in Dust-Collectors, of which the following, taken in connection with the accompanying drawings, is a specification.

Our invention relates to collectors designed to be used in separating dust from air holding it in suspension; and it has for its object the separating of the dust from the air.

Figure 1 represents acollector in elevation, and Fig. 2 is a plan of Fig. 1. Fig. 3 is a vertical sectional View of collector on sectionline 6 6 of Fig. 2, looking toward inlet-spout. Fig. l represents cone and cylindrical base in elevation, showing means of reducing the area of the annular dust-outlet; and Fig. 5 is a plan of Fig. 4, with the addition of the collector-body represented in cross-section.

All the parts composing the collector are preferably made of galvanized plate-iron, and riveted andsoldered together.

The collector-body 7 is provided with the annular head 8, to which is fastened the tub ular guard 9, which is providedwith the opening 19; inlet-spout 10, which is provided with the opening 18; hollow frustum 11, which is fastened to collector-hody by means of the fastening-strips l2, and which is provided with the opening 21; hollow frustum 13, which is fastened to collector-body by means of the fastening-strips 14, and which is provided with the opening hollow cone 15,which is fastened to collector-body by means of fastening-strips 16, and which is provided with the cylindrical base 17, which is of such a diameter as will leave between it and the collectorbody an annular dust-outlet.

The cylindrical base 17, provided with the hollow cone 15, is located within and near the lower portion of the collector-body. The hollow frustums are located Within the lower portion of the collector-body. The base of frustum 13 is but a short distance above the base of the cone, and the base of the frustum 11 is about twice the distance above the base of frustum 13 as the base of fruslum 13 is from the base-of the cone.

The relative proportions and sizes, as shown in the drawings, should and may be varied to comply with the conditions required for the separating of different kinds of dustladen air.

The operation of the collector is as follows: The dust-laden air is forced, by means of a fan, in the usual way through the pipes (not shown) and through the inlet-spout into th e an nular space 22 between the'tubular guard 9 and the collector-body 7. The direction taken by the dust-laden air is down spirally in the annular space 22 until the dust-laden air strikes the hollow frustum 11. Then the following separation takes place: The dust, by reason of centrifugal force, is forced against the inside of the collector-body, then through the annular space between the base of the hollow frus- 7o tum 11 and the collector-body, then through the annular space between the base of the hollow frustum 13 and the collector-body, then through the annular space between the cylindrical base 17 and the collector-body, and then falls from that space out of the collector into any suitable dustreceptacle, while the purified air, after separation from the dust, is reversed and forced up through the tubular guard 9 and out of the collector through opening 19.

The duty of the hollow frustums is to turn or reverse the direction of the purified air from its downward spiral course into its upward course through the tubular guard.

The duty performed by the openings 20 and 21 is to allow the escape of the purified air which may be carried down below the hollow frustums.

The object of having two hollow frustums is to more thoroughly separate fine dust from dust-laden air.

The number of hollow frustums is determined by the kind of dust-laden air the collector is designed to separate, while for some 5 kinds of dust-laden air the hollow frustums may be dispensed with; and to prevent the clogging of the annular space between the cylindrical base and the collector-body by reason of the strips 16, which may be dis- 1'00 pensed with, the cylindrical base and hollow cone may be supported in their position by means of U-shaped stripslike 23* one of which is represented in Fig. 1.

For some purposes it may be desirable to contract or lessen the area of the annular space between the cylindrical base and the collector-body. This may be accomplished by the placing of strips, as shown by Figs. 4 and 5, as follows: To reduce the area onehalf, four vertical strips 24, placed quartering within the annular space, may be used, and to M the top of each of the strips 2t may be fastened one of the strips 25, which extends spirally to the bottom of the collector-body, or to a point half-way between the vertical strips. The tubular guard 9 is constructed as shown, having a spiral lower portion, in order to present a more open outlet for the purified air forced through it. Its greatest length is located at a point on its circumference, as shown and as represented by dotted line 26 26, Fig. 2, where it crosses the circumferential outline of the tubular guard. This isfor the purpose of providing the longest annular space 22 for the dust-laden air to be forced into. The angle of the hollow frustums and hollow cone may be increased or diminished.

If desired, triangular strips of metal may be placed vertically within the annular space between the cylindrical base 17 and the inside of the collector-body, as represented by dotted lines, Fig. 3, as 27, to act as feathers in preventing the continued rotary motion of the dust.

The important object sought to be obtained by our collector is as follows: The dust having been forced against the inner surface of the collector-body and having acquired momentum due to centrifugal force, it is essential for effective operation that the momentum so obtained should be retained until the dust has passed through the collector. Such is the case if the dust particles are not forced together by the usual device of a cone, which, when used, permits the dust particles to lose their momentum due to centrifugal force, thereby permitting the dust to escape with the purified air-a fault that is remedied by the use of our collector.

What we claim as new, and desire to secure by Letters Patent, is

1. A dust-collector adapted to receive dustladen air from a fan, provided with the col.- lector-body having the inlet-spout 10, through which dust -laden air is forced, cylindrical base 17, between which and the collector-body is an outlet for the passage of the dust, and the tubular guard 9, located within the upper portion of the collector-body through which the purified air is forced, substantially as and for the purpose set forth.

2. A dust-eol1ector provided with an inletspout through which dust-laden air is forced, frustums 11 and 13 and cylindrical base 17, between which and the collector-body are out lets for the passage of the dust, and tubular guard 9, located within the upper portion of collector-body through which the purified air is forced, substantially as described.

3. A dust-collector provided with an inletspout through which the dust-laden air is forced, cylindrical base 17, between which and the collector-body is an outlet for the passage of the dust, and the tubular guard 9, located within the upper portion of the collector-body through which the purified air is forced, in combination with means of reducing the area of said dust-outlet, substantially as described.

4. A dust-collector provided with an inletspout through which dust-laden air is forced, cylindrical base 17, between which and the collector-body are outlets for the passage of the dust, and tubular guard 9, located within the upper portion of the collector-body through which the purified air is forced, in combination with the U-shaped strips, as 23, as a means of fastening said cylindrical base to collector-body, for the purposes substantially as specified.

In testimony whereof we have signed our names to this specification, in the presence of two subscribing witnesses, on this 21st day of March, A. D. 1888.

JAMES A. \VOODBURY. EDVVART) F. \VOODBURY.

\Vitnesses:

J. L. BAILEY, WALTER L. PERRY. 

